Preparation method of carboxymethyl chitosan film

A technology of carboxymethyl chitosan film and carboxymethyl chitosan, which is applied in the field of preparation of carboxymethyl chitosan film, can solve the problem that carboxymethyl chitosan cannot use conventional film-making process and film-making process Preparation, difficult film formation and other problems, to achieve the effect of green raw materials, wide application and strong antibacterial property

Inactive Publication Date: 2019-02-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been many reports on the preparation methods of chitosan films in the literature, but unlike chitosan, carboxymethyl chitosan is easily soluble in water, and its aqueous solution is not easy to form a film when dried, so carboxymethyl chitosan cannot Prepared by conventional film-making process and chitosan film-making process

Method used

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  • Preparation method of carboxymethyl chitosan film
  • Preparation method of carboxymethyl chitosan film
  • Preparation method of carboxymethyl chitosan film

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Take 0.3g of carboxymethyl chitosan and add it to 99.7ml of water to obtain a 0.3% carboxymethyl chitosan solution, and then add glycerin and CTAB. The glycerol concentration is 5wt% and the CTAB concentration is 0.1wt%. Stir for 1h. Then pour the mixed solution into a D160mm petri dish and place it at 30°C for 0.5h under vacuum and degassing. Place the defoamed solution at 50°C for 8h. Take out the dry petri dish and pour it into an excess alcohol coagulation bath for 0.5h. The decarboxylated chitosan wet film was dried at 30°C for 10 hours. Then, carboxymethyl chitosan can be obtained, and the film thickness is about 10 μm.

Embodiment 2

[0023] Take 0.3g of carboxymethyl chitosan and add it to 99.7ml of water to obtain a 0.3% carboxymethyl chitosan solution, and then add glycerin and CTAB. The glycerol concentration is 5wt% and the CTAB concentration is 0.1wt%. Stir for 1h. Then pour one-half of the mixed solution into a D160mm petri dish and place it at 30°C for 0.5h under vacuum and degassing. Place the defoamed solution at 50°C for 8h. Take out the dry petri dish and pour it into an excess alcohol coagulation bath for 0.5h. Place the removed carboxymethyl chitosan wet film at 30°C for 10 hours. The carboxymethyl chitosan film can be obtained, and the film thickness is about 5 μm.

Embodiment 3

[0025] Take 0.6g carboxymethyl chitosan and add it to 99.4ml water to obtain a 0.6% carboxymethyl chitosan solution, then add glycerin and CTAB, where the glycerol concentration is 5wt%, the CTAB concentration is 0.1wt%, strong Stir for 1h. Then pour the resulting mixed solution into a D160mm petri dish and place it at 30°C for 0.5h under vacuum and degassing. Place the defoamed solution at 50°C for 8h. Take out the dry petri dish and pour it into an excess alcohol coagulation bath for 0.5h. Place the removed carboxymethyl chitosan wet film at 30°C for 10 hours. Then, carboxymethyl chitosan can be obtained, and the film thickness is about 13 μm.

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Abstract

The invention discloses a preparation method of carboxymethyl chitosan film. The method is conducted according to the following steps that 1, carboxymethyl chitosan is taken, and is dissolved in waterto form a 0.1-5wt% carboxymethyl chitosan solution, then appropriate amounts of plasticizer and surfactant are added to make the concentrations of the plasticizer and the surfactant equal to 1-10wt%and 0.1-1wt% respectively, and intense stirring is conducted for 0.5-2 h to obtain a casting solution; 2, an appropriate amount of the casting solution is poured in a film-forming container, at 25-50DEG C, vacuum decompression defoaming is conducted, and then in an oven, drying is conducted to form film; 3, in the film-forming container containing the dry film, excessive solidifying liquid is added for a solidifying bath for a certain time, so that wet carboxymethyl chitosan film is obtained, wherein the solidifying liquid is ethyl alcohol or methyl alcohol or acetone, and the purity of the solidifying liquid is larger than 90%; 4, the obtained wet film is dried to obtain the carboxymethyl chitosan film. The preparation method of the carboxymethyl chitosan film is simple, the raw materials are environmentally friendly, the thickness of the film is controllable, and the prepared carboxymethyl chitosan film is wide in application, and can be applied to the aspects of energy, fresh keeping, medicines and the like.

Description

(1) Technical field [0001] The invention belongs to the technical field of polymer membranes, and relates to a preparation method of a carboxymethyl chitosan membrane. (2) Background technology [0002] Chitin is a typical cationic polysaccharide biological macromolecule. It is widely found in the shells of shrimps, crabs, insects, and cells of lower plant fungi and algae in nature. It is the largest nitrogen-containing natural on earth except protein. Organic compounds. There are tens of billions of tons of biosynthesized chitin in the world each year, and billions of tons of chitosan can be extracted. It is a natural polymer compound whose output is second only to cellulose. Carboxymethyl chitosan is a water-soluble chitosan derivative with many properties, such as strong antibacterial properties, fresh-keeping effect, and an amphoteric polyelectrolyte. It has many applications in cosmetics, preservation, medicine, etc., and it is also one of the chitosan derivatives that hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K5/053C08J5/18
CPCC08J5/18C08J2305/08C08K5/053
Inventor 陶新永陈媚盛欧微金成滨袁华栋居治金竺泽昊
Owner ZHEJIANG UNIV OF TECH
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